I "may" have found the answer.. Surprised the author didn't dig just a little deeper.

Ingram's Left Foot buckeling

Left foot Turf Toe/ Sprain
Posted Dec. 18, 2011
The Saints have placed Ingram on injured reserve, ending his season. Ingram, who won the 2009 Heisman Trophy at Alabama, missed New Orleans' last four games because of a sprained toe on his left foot. Coach Sean Payton says the injury got worse during practice last week and basically ensured he wouldn't be able to catch up in time to contribute this season. Ingram carried 122 times for 474 yards and five touchdowns this season. His longest run was a 35-yard touchdown against the New York Giants on Nov. 28.ProFootballWeekly.com - Mark Ingram

Reports: Saints RB Ingram to miss postseason
Posted Jan. 01, 2012 @ 3:09 p.m. ET
The Saints will be without rookie RB Mark Ingram for the playoffs. The first-round pick will have season-ending surgery on his toe this week.